New planar SQUIDs based on niobium technology
Abstract
Using nanobridges as Josephson contacts, two new SQUID-variants have been made and tested. The first is a dc SQUID whose hysteretic weak links are inductively shunted, such that it operates as a relaxation oscillator with a frequency depending on applied magnetic flux. Employing standard ICs for FM detection, the read-out electronics becomes cheap and very compact, fitting into the size of a matchbox. The second variant is a microwave biased rf SQUID incorporated in a lambda/2 stripline resonator, which is capacitively coupled to a coaxial cable leading to the room temperature electonics. Peak-to-peak modulation voltages of several hundred microvolts were obtained in the investigated frequency range of 3 to 4.2 GHz.
- Publication:
-
Fizika Nizkikh Temperatur
- Pub Date:
- May 1990
- Bibcode:
- 1990FizNT..16..595M
- Keywords:
-
- High Temperature Superconductors;
- Josephson Junctions;
- Niobium Compounds;
- Squid (Detectors);
- Magnetic Flux;
- Planar Structures;
- Relaxation Oscillators;
- Waveguides;
- Electronics and Electrical Engineering